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Abdul, while driving to school, computes the average speed for... - Science
Question
Abdul, while driving to school, computes the average speed for his trip to be 20 \text{ km h}^{-1}. On his return trip along the same route, there is less traffic and the average speed is 30 \text{ km h}^{-1}. What is the average speed for Abdul’s trip?
Answer
Given:
Speed to school (v_1) = 20 \text{ km/h}
Speed on return (v_2) = 30 \text{ km/h}
Formula:
Since the distance is the same for both trips, we use the formula:
Average Speed = \frac{2v_1 v_2}{v_1 + v_2}
Calculation:
= \frac{2 \times 20 \times 30}{20 + 30}= \frac{1200}{50}= 24 \text{ km/h}
Answer: The average speed for Abdul’s trip is 24 \text{ km/h}.